Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c215596b5c9efc…

MALICIOUS

PDF

81.3 KB Created: 2021-05-03 04:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4421c8a8a1fdc091385f65cd3013ff34 SHA-1: 4440d791ff62659c82327b1affe1ddfd87d665ff SHA-256: 16c215596b5c9efc9dcd83e047f5a59d2985c946e0327fa98340a1a7e2f100f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=hp+officejet+7110+printhead+alignment
    • https://cdn.sqhk.co/pomorezolo/diiQ7ih/rudekazodin.pdf
    • http://loduwij.scienceontheweb.net/historia_de_una_escalera_characters.pdf
    • http://zaxevef.getenjoyment.net/31984078842.pdf
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdf
    • http://rivimebowov.22web.org/how_to_plot_xy_graph_in_excel_2007.pdf
    • http://mexawolin.medianewsonline.com/88196814790.pdf
    • http://fuzuwozozat.mypressonline.com/questes_de_atualidades_para_concurso_2020.pdf
    • http://nupifijaw.getenjoyment.net/kudetikijakirogimidiv.pdf
    • http://banademebilite.sportsontheweb.net/38_bcs_result_download.pdf
    • https://cdn.sqhk.co/ropobemuma/jdidlGP/skyward_student_login_bisd.pdf
    • http://dumigegin.medianewsonline.com/spanish_catholic_bible_download.pdf
    • https://cdn.sqhk.co/liwijodi/hIjchcq/google_chrome_32_bit_xp.pdf
    • http://gejulavofanutar.mygamesonline.org/92353645310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_063b34fac2404d7aa4f04031f4610c06.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_a80cce3a205f448da9a07e1804bebc7a.pdf?index=true
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_6e816c816d4a4e818c5e435ff4abc8c4.pdf?index=true
    • http://xabudavadeguvo.myartsonline.com/zolel.pdf
    • http://xubibufopude.epizy.com/bifelepudagawoxegi.pdf
    • http://mepitar.atwebpages.com/wobotigonexamanajila.pdf
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_561e5ed5fc2649ffb5ccfc5865309d85.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccf.bin
f6405de387ee4f1263a38a1a0489da2ae49043dd0752ee7528f082d903da36e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 5704 bytes
font_01_sfnt_off0000f029.bin
eb66b53826e2a0386195b82eeee7a4f05eaf44255a332f148dffcf8eda091cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 21116 bytes
font_02_sfnt_off0001210e.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16092 bytes

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